// @flow

/**
 * 运行环境API
 */

const element: HTMLElement | null = document.getElementById('app')


// 不同环境api对应的生明
// https://github.com/facebook/flow/blob/master/lib/core.js
// https://github.com/facebook/flow/blob/master/lib/dom.js
// https://github.com/facebook/flow/blob/master/lib/bom.js
// https://github.com/facebook/flow/blob/master/lib/cssom.js
// https://github.com/facebook/flow/blob/master/lib/node.js




